Abstract:
The potential for using Warm Mix Asphalt (WMA) in reclaimed asphalt
pavement (RAP) is becoming more interesting topic nowadays due to economic
and environmental benefits. WMA technology allows reductions in production and
compaction temperatures guaranteeing relevant environmental cost saving benefits.
The objectives of the present study were to investigate and evaluate the performance
of a typical additive in WMA pavement with RAP on rutting, fatigue cracking and
thermal cracking resistance, which was used on Rhode Island (RI) Route 102. The
asphalt binder was tested at different dosages of WMA additive using Dynamic
Shear Rheometer (DSR), Rolling Thin Film Oven (RTFO), Pressure Aging Vessel
(PAV), Multiple Stress Creep Recovery (MSCR), and Bending Beam Rheometer
(BBR). It was found that 0.70% additive would lessen pavement damage in case of
rutting, fatigue cracking and thermal cracking. After that, twoHMAspecimens, with
and without RAP and two WMA specimen with and without RAP were prepared
using Superpave Gyratory Compactor (SGC). These specimens were tested with the
AsphaltMixture Performance Tester (AMPT) and developed master curves for each
specimen. It was observed that WMA mixtures with RAP, could perform better in
fatigue resistance but expected to have poor rutting performance than HMA and
HMA-RAP. This study indicates that addition of WMA additives performs better in
fatigue resistance.
